fix(deps): update auto-update-external to v12.9.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -9,7 +9,7 @@ configLib = "4.8.1"
 mariaDBConnectorJ = "3.5.9"
 hikaricp = "7.1.0"
 jdbi = "3.53.0"
-flyway = "12.8.1"
+flyway = "12.9.0"
 jspecify = "1.0.0"
 junit = "6.1.0"